Indentation rolling resistance based on a three-parameter Kelvin solid model

Abstract

The indentation rolling resistance of a belt conveyor with stable operation accounts for more than 60% of the total resistance. Thus, the effective reduction of indentation rolling resistance and its energy consumption have attracted considerable attention of engineers. Indentation rolling resistance is due to the viscoelasticity of conveyor belt. A threeparameter Kelvin solid model is used to characterize the viscoelasticity of materials. The parameters of the Kelvin solid model include two elastic moduli E 0 and E 1 and one viscous coefficient h 1 , and their fitting functions are obtained by completing a dynamic tensile test. A mathematical model of indentation rolling resistance is derived, on the basis of theoretical analysis, which is directly expressed by belt speed, idler radius, and cover layer thickness under the conveyor belt, and is indirectly expressed by normal load and temperature. The influence of five factors on indentation rolling resistance and the influence of combined conditions of any two factors on indentation rolling resistance are separately analyzed on the basis of the mathematical model. The theory in this study is accurate based on the consistency between the theoretical calculation and experimental results. In practical engineering, the operating conditions of belt conveyors are any combination of all factors. Various factors should be considered to reduce indentation rolling resistance.

A Multi-Scale Study on the Property Degradation of High-Temperature Treated Beishan Granite

“…Many natural pores and tectonic fractures are distributed inside rock; they develop under loading and increasing temperature and eventually cause damage and failure. Among various mechanical components, the Calvin body can be used to characterize the viscoelastic properties of materials [44], and can be used to establish constitutive models for the mechanical response of materials such as rocks. However, since such models do not include damage properties to consider the influence of thermal damage of granite, this paper assumes that the mechanical model of granite consists of a Calvin body and a damaged body in parallel, as shown in Figure 9.…”